Sunlube Diesel Engine Oil SAE 40 is a premium heavy-duty lubricant formulated from high-quality base oils and carefully balanced chemical additives. It is designed for high-output naturally aspirated or supercharged diesel engines operating under severe conditions. This oil provides excellent protection against wear, deposits, and lubricant thermal breakdown. It is recommended for use in automotive, agricultural, mining, and construction equipment, as well as stationary diesel engines such as land-based water pumps. The high Base Number ensures strong performance when using high-sulfur diesel fuels, maintaining optimal engine cleanliness and protection over extended oil drain intervals.